1.

Which of the following is an example of endothermic reaction

Answer»

`C_(2)H_(2)+2H_(2)rarrC_(2)H_(6),DeltaE=-314.0 kJ`
`C+O_(2)rarrCO_(2),DeltaE=-393.5 kJ`
`N_(2)+O_(2)rarr2NO,DeltaE-180.5 kJ`
`2H_(2)+O_(2)rarr2H_(2)O, DeltaE+571.8 kJ`

Solution :Heats of combustions are always exothermic except oxidation of N as.
`N_(2)+(1)/(2)O_(2)rarrN_(2)O DeltaH=+ve`
`N_(2)+O_(2)rarr2NO DeltaH=+ve`


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